混联半波长交流输电线路最优配比及联网性能研究

随着大电网的发展及能源互联网概念的提出，半波长交流输电技术（HWACT）受到广泛关注，而架空线一电缆混联型半波长线路有望成为一种新的输电方式。为深入研究混联型半波长线路的特性，对混联型半波长线路的最优配比及联网特性进行了分析。首先，推导了单回输电线路的物理及数学半波长（HW）。然后，对混联型线路的半波长进行分析，提出了最优配比的概念及定义。根据半波长线路的特性构造最优化函数，实现对最优配比的求取。最后，利用2020年规划电网数据进行仿真实验，将混联型与常规型半波长输电系统进行对比。通过研究不同故障情况下的功角摆动曲线，对混联型半波长输电线路的联网性能进行评价。结果表明，按照最优配比原则组成的混联型半波长输电线路可有效提升系统阻尼，其构建的同步电网具有较强稳定性。

A Secure Trust Model for P2P Systems Based on Trusted Computing

Trust is one of the most important security requirements in the design and implementation of peer-to-peer （P2P） systems. In an environment where peers＇ identity privacy is important, it may conflict with trustworthiness that is based on the knowledge related to the peer＇s identity, while identity privacy is usually achieved by hiding such knowledge. A trust model based on trusted computing （TC） technology was proposed to enhance the identity privacy of peers during the trustworthiness evaluation process between peers from different groups. The simulation results show that, the model can be implemented in an efficient way, and when the degree of anonymity within group （DAWG） is up to 0.6 and the percentage of malicious peers is up to 70%7 the service selection failure rate is less than 0.15.